Isotropic Radiators MCQ’s

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This set of Antenna Multiple Choice Questions & Answers (MCQs) focuses on “Isotropic Radiators”.

1. In Isotropic radiation, which of the following vector component is absent in pointing vector?
a) \widehat{a_r}
b) \widehat{a_\theta}
c) \widehat{a_\emptyset}
d) Both \widehat{a_\theta} \,and\, \widehat{a_\emptyset}

2. For an isotropic source, Radiation intensity will be _____ on θ and ______ on Φ.
a) Dependent, independent
b) Independent, independent
c) Independent, dependent
d) Dependent, dependent

3. What is the amount of Electric field present at a distance of 10km for an isotropic radiator with radiating power 3kW?
a) 30mV/m
b) 60mV/m
c) 15mV/m
d) 10mV/m

4. An ideal source in which the power is radiated equally in all directions is called as ________ radiator.
a) Isotropic
b) Omni-directional
c) Directional
d) Transducer

5. What is the radiation intensity for isotropic antenna having radiation power density \frac{3 sin⁡θ}{r^2}a_r W/m^2?
a) 3sinθ ar W/Steradian
b) 3cosθar W/Steradian
c) 6πsinθ ar W/Steradian
d) 6πcosθ ar W/steradian

6. Find the effective length of a receiving antenna with open circuit voltage 1V and incident electric field 200mV/m?
a) 0.2m
b) 50m
c) 5m
d) 5cm

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